I can only recommend the Yume Nikki Online (YNO) Project. It's basically an online implementation of a bunch of Yume Nikki fangames, the most popular one with about 200 players online at seemingly all hours of the day being Yume 2kki (a pun on 2 being pronounced "ni" in Japanese), which sort of the "fan-made sequel" to Yume Nikki. It also got .flow and the relatively new Collective Unconscious, which I personally am a big fan of because it's feels like a polished Yume Nikki fangame in some weird way.